[2020] Rainbow six siege is crashing.

Hey, Landon.le!

Welcome to the forums. Sorry to hear that your friend is experiencing this issue and thank you for the steps that you have already tried with them.

Can you ask your friend to try the following:

Run the game with ADMINISTRATOR RIGHTS.

Verify your game files.
It is possible that the installation of your game is faulty. To fix this, please verify your game files:

UPLAY
EPIC GAMES LAUNCHER
STEAM

Disable Background Applications.

Make sure your OPERATING SYSTEM is UP TO DATE.

Reinstall Uplay.

Update your GPU Drivers:

AMD
NVIDIA

Should the issues persist after completing the above steps, please GET IN TOUCH, attaching DXDIAG and MSINFO reports to your SUPPORT CASE.

Thank you.